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HP LaserJet - MICR Printers for Check Printing Are Available through TROY Group Inc.

Troy provides the support for the MICR printers that are covered under a bench warranty. Printers that have an onsite warranty or a service contract (including Support Packs) are supported by both Hewlett-Packard and Troy. Hewlett-Packard has an agreement with Troy to provide hardware support and dispatch technicians onsite for those printers. Troy provides support for Troy related issues and software. Contact TROY technical support at http://www.troygroup.com/support.html .

MICR characters are the characters at the bottom of a check, sometimes referred to as the MICR line. These characters are used to process checks by a special machine that scans the MICR line. This process is based on a technology called Magnetic Ink Character Recognition or MICR. This technology uses magnetic reading to identify these unique numbers and characters.
In non-MICR print mode, TROY MICR printers use all the HP Laser Jet printer's features and functionality. When doing MICR printing, the printers produce high-quality MICR characters and signal levels for both E-13B and CMC-7 standard MICR fonts. TROY font and toner kits are available for the majority of the HP LaserJet printers.
The TROY modifications include:

MICR font DIMM which the optical toner sensor plugs into

Optical sensor which detects the MICR print cartridge

A voltage regulator board which plugs into the MICR DIMM, the optical sensor, and the engine control board

Troy printers work the same as their HP counterparts except that when printing MICR a low toner message will stop printing

warning:

HP does not support using MICR toner products in LaserJet printers that have not been modified to the TROY specification.